{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LX4FK340","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LX4FK340","canonicalUrl":"https://aoctrl.com/schneider/LX4FK340","factsUrl":"https://aoctrl.com/api/mcp/products/LX4FK340","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric TeSys LX4FK340, contactor coil, 340 V DC, DC low consumption, 45...60 ms opening, 50...60 ms closing.","salesMarkdown":"The LX4FK340 is a replacement contactor coil from the Schneider TeSys range, designed for DC control circuits at 340 V DC nominal. It is a service part — category 18401-WORLD SERVICE PARTS(CTR ACCESS) — meaning it was stocked for field replacement of a failed coil in an existing TeSys contactor, not for new builds. Coil technology is DC low consumption without a built-in suppressor module. That matters: if your circuit relies on the coil's own suppression for transient control, you will need to add an external flyback diode or RC snubber across this coil. The average resistance is 89.6 Ohm inrush and 21750 Ohm holding at 68 °F (20 °C), so the inrush current is roughly 3.8 A before the coil drops to its holding current of about 16 mA. ## Control voltage limits and operating window The coil is rated for 340 V DC control voltage, with an operational range of 0.85 to 1.1 Uc at 131 °F (55 °C) — so it will pick up reliably between about 289 V DC and 374 V DC. Drop-out occurs between 0.2 and 0.35 Uc at the same temperature, meaning the contactor drops out between 68 V DC and 119 V DC. This wide dropout band is typical of DC low-consumption coils and means the contactor will not chatter on a sagging DC bus, but it also means the coil will not release until the voltage falls well below nominal. Operating time is 45 to 60 ms for opening and 50 to 60 ms for closing. This is a standard speed for a TeSys contactor coil — fast enough for most motor-starting and general switching duties, but not a high-speed or DC-switching-optimized coil.","metaTitle":"Schneider TeSys LX4FK340 Contactor Coil, 340 V DC, Obsolete","metaDescription":"Obsolete Schneider TeSys LX4FK340 contactor coil, 340 V DC control voltage, DC low consumption. Sourced to order against RFQ. Last-time-buy opportunity.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Contactor & Starter Coils"],"specifications":{"Range":"TeSys","Category":"18401-WORLD SERVICE PARTS(CTR ACCESS)","Operating time":"45...60 ms opening 50...60 ms closing","Coil technology":"Without built-in suppressor module","lifecycle_stage":"current","Device short name":"LX4FK","Average resistance":"89.6 Ohm inrush 68 °F (20 °C) 21750 Ohm holding 68 °F (20 °C)","Control circuit type":"DC low consumption","Nbr. of units in pkg.":"1","Product or Component Type":"Contactor coil","[Uc] control circuit voltage":"340 V DC","Control circuit voltage limits":"Drop-out 0.2...0.35 Uc 131 °F (55 °C)) Operational 0.85...1.1 Uc 131 °F (55 °C))","Ambient Air Temperature for Operation":"23...131 °F (-5...55 °C)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f09ffb6099938af7844c4be9a2c2f678.pdf","sourceUrl":"https://www.se.com/th/en/product/LX4FK340/contactor-coil-fk-340v-dc/","alternativesUrl":"https://aoctrl.com/api/mcp/products/LX4FK340/alternatives.json"},"ai":{"faq":[{"question":"What replaces the LX4FK340?","answer":"There is no official successor order code listed in the lifecycle record. If you need a pin-compatible replacement, you will need to check the TeSys contactor frame it mates with and select a current-production coil for that frame at 340 V DC. The LX4FK340 is a service part for an existing contactor, not a current-design component."},{"question":"What is the control voltage and coil type?","answer":"The LX4FK340 is a 340 V DC coil, DC low-consumption type, without a built-in suppressor module. The operational voltage range is 0.85 to 1.1 Uc (about 289 to 374 V DC) at 131 °F (55 °C), and dropout occurs between 0.2 and 0.35 Uc (68 to 119 V DC)."},{"question":"How do I source the LX4FK340?","answer":"Because it is obsolete, the part is sourced through surplus and last-time-buy channels. Submit an RFQ; we will check our inventory and broker network for remaining new-old-stock units. This is a quoted-to-order part — no stock is held on the shelf."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LX4FK340","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/LX4FK340 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}